1. LIGHTING EFFICIENCY Neil Hope Taylor McKenzie

2. LIGHTING EFFICIENCY the amount of visible light produced for a given energy input

3. Historically, lightbulbs were purchased based on energy consumption Today, more informed decisions may be made based on a bulbs light output and energy consumption However, not all lightbulbs light output is the same

4. Luminosity Function Response of the Human Eye to light

5. Sources of Inefficiencies Heat generation Generation of radiation outside the visible spectrum

6. Lighting Options Incandescent lamps Fluorescent Lamps LED (lamps) Electron Stimulated Luminescence Halogen Lamps Sodium Lamps

7. Electron Stimulated Luminescence

8. Sodium

9. Household Lighting

10. Lighting Efficacy

11. Thank You Any Questions? – eg When does the break start? Sooner if you dont ask questions